Fitness is not a measure of worth.

People who choose exercise activities, meaning various types of movement or fitness, as a hobby are no more praiseworthy than people who choose anything else as a hobby.

Fitness by any definition is not an obligation.

There is also no personal obligation to have a thin, or a “normal-weight", body.

Seeking weight-loss is not the same thing as living with healthy habits, and thin or "not fat" isn’t the same thing as "Healthy".

There are healthy and unhealthy people at every size, so reaching a certain body size is neither a guarantee of health, nor a sure preventative or cure for disease. Body Size and Health are two different things and people can, and often do, pursue one without the other.

In fact, seeking "Health" is not a moral, social, or personal obligation. People can choose to prioritize and pursue health at whatever level they want. Their choice to seek health by “engaging in a healthy lifestyle” doesn’t guarantee them personal health. It also doesn’t make them better than people who don’t choose to prioritize or pursue health.

There are also different kinds of health. and all of them aren't available to everyone.  For example: Mental health and Physical health are two different things, and these two types of health don’t necessarily go together.

What does "healthy" even mean?

Healthy is simply the opposite of  diseased or dead.  Human beings are born, they live, and they die.  The human body is designed to wear out.  Even the most "healthy" bodies become "unhealthy" as they get old, and eventually every body ceases its function. Sudden or lingering, death comes to everyone, and except for death-by-accident, people of all ages become sick and then die.

While the term "healthy", refers to the general condition of a person's mind and body, usually meaning to be free from illness, injury or pain, that term is now loosely used to refer to various substances, activities, and ideas that allegedly promote that general condition.

However, despite all claims to the contrary, most things ...  including personal values ...  that are sold to us by the diet (and fitness) industry are the exact opposite of “healthy”.

A Bigot is someone who, as a result of their own prejudices, thinks of other people with contempt, or intolerance on the basis of that other person's characteristics. Bigotry is the state of mind of a Bigot, and thoughts often tend to become actions.

Those who wish to be, or appear to be, "politically correct" in today's society, know they must work to filter out their prejudices against various characteristics such as ethnicity, gender, disability, socioeconomic status, sexual orientation, etc.

However, even the most "liberal" people commonly practice Bigotry when it comes to the physical characteristics of people who have Fat bodies. Our current society still accepts, allows, and encourages such thinking and behaviors.

Here, the term "Fat Bigot" is used to define someone who is prejudiced against the physical characteristics of people who have fat bodies, not someone who HAS a fat body. 

When Fat Bodies Just Look Wrong 
   
             by Ragen Chastain.

There is a post over on This is Thin Privilege written by a girl who was told that she couldn’t wear the same shorts as a thinner student because she didn’t “present” the same way as the other student.  This highlights a particular kind of fat bigotry wherein fat bodies are judged to look “wrong” doing the same thing that thin bodies do, just because they are fat.

Wrong can take a lot of meanings in this context, one of the first is the idea that they look obscene (remember the Lane Bryant ad that showed about 25% of the skin of a Victoria’s secret ad but was controversial because it was judged look obscene - obscene here meaning “omg big boobs!”?)  Or, as in the example from above, fat bodies are seen as un-presentable, or needing to be more covered/hidden than other bodies.

And how many times have we heard the “fat girl” rules of fashion – black clothes absorb light and hide our shape (aka “slimming”), choose clothes based on their ability to make you look as much like the thin ideal as possible (aka “Flattering“) and that anything else is an affront to everyone who sees us and a moral failing on our part.

This type of situation is often about a bigot asking to be accommodated by a fat person.  The assumption being that if someone doesn’t like fat bodies, doesn’t like looking at fat bodies, doesn’t think that fat bodies should do certain things or dress in certain ways, then the people with those fat bodies have a responsibility – nay, an obligation – to “fix” the situation by doing what the fat hater wants us to do.  As if the solution might not be for them to get the hell over their bigotry, or at least practice the ancient art ...